David and i have been talking about this for some time.
what is needed is a real global optimization algorithm. my leaning is
to make do it at the rtl level because that is where everything has been
exposed. but it would be a lot easier in ssa form.
The first step in my opinion is to ask t
On Thu, Oct 4, 2012 at 2:18 PM, Eric Botcazou wrote:
>> Any suggestion about how I could avoid generating this zero_extension?
>
> Redundant extensions have been a hot topic for some time. The combiner should
> catch the local easy cases, we have ree.c for the nonlocal easy cases and Tom
> recent
> Any suggestion about how I could avoid generating this zero_extension?
Redundant extensions have been a hot topic for some time. The combiner should
catch the local easy cases, we have ree.c for the nonlocal easy cases and Tom
recently posted:
http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00
Hi,
I have recently added ARM support for builtin_bswap16, which uses the
rev16 instruction when dealing with an unsigned argument.
Considering:
unsigned short myfunc(unsigned short x) {
return __builtin_bswap16(x);
}
gcc -O2 generates:
myfunc:
rev16 r0, r0
uxthr0, r0
